Trevelyan College (known colloquially as Trevs) is a college of Durham University, England. Founded in 1966, the college takes its name from social historian George Macaulay Trevelyan (pronounced "Trevillian"), chancellor of the university from 1950 to 1957. Originally an all-female college (the last to open in England), the college became fully mixed in 1992.

Trevelyan is noted in Durham for its hexagon-featuring architecture and for the display of daffodils that surrounds it every spring. As a constituent college of Durham University, Trevelyan is listed as a higher education institution under the Education Reform Act 1988. It is owned and for the most part run by the university.

During the early 1960s, the British Government commissioned the Robbins Report to look into the future of higher education in the UK. When published, the report recommended the expansion of universities and the student population. This was accepted as government policy. In 1963, the University of Newcastle was officially established as a separate entity from the University of Durham, which meant that new colleges within Durham were required in order to meet the number of new university places that the Government wished to create. As a result, the university planned for three new colleges on Elvet Hill; these went on to become Collingwood, Trevelyan and Van Mildert.

Trevelyan was planned to become an all-women college, similar to St Mary's and St Aidan's, so as to increase the female population of the student body. The college was built on farmland south of St Mary's off Elvet Hill Road, which was owned by a local family, the Carpenters. Originally this land was intended to accommodate not only the new college, but also a University Assembly Hall with a capacity of 1,500 people; however, the site was too small to accommodate both.

After much delay, the college was opened in October 1966 with 78 students. The official opening took place on 12 March 1968 by Lord Butler, Master of Trinity College, Cambridge, who was invited in view of the connection G. M. Trevelyan also held with Trinity. During the opening, a serenade in three movements composed by Sir Malcolm Arnold (whose daughter was in the first intake of students), called "The Trevelyan Suite", was played. Other people at the opening include the Chancellor, the Vice-Chancellor, two Pro-Vice-Chancellors, the Bishops of Durham and of Ripon (whose wife, Mary Moorman, was a relative of Trevelyan and also present) and the Mayor and Mayoress of Durham. Trevelyan was the last purpose-built all-female college to be built for a British university.

In 1973, a 300-person capacity hall, the Sir James Knott Hall, (known colloquially as the "JKH") was opened in the presence of the Duke of Northumberland. The purpose of the hall was to provide more facilities for Trevelyan students, such as a badminton court and extra music rooms, as well as to create a conference facility for the purpose of wealth creation for the college. In 1988 an extension to the hall, the Dowrick Suite, was added, named after a professor of the law department, Frank Dowrick, who was a longtime member of the Senior Common Room. Inside the main college building is the Mowlam Room, a postgraduate common room which previously housed a bust of Mo Mowlam, a well-known Trevs alumna. This bust is currently located in the entrance hall of the college.

In 1981, the bar, which had previously been located within the small area now hosting the buttery was moved to its present location in the former cloisters of the college. In order to make this a practical bar environment the cloisters were roofed over. The area above this new roof is nicknamed "The Goldfish Bowl" by students, due to the proximity of the windows looking into other rooms.

In 1987, the Governing Body of the college voted to follow Hatfield and Castle in becoming mixed-sex, despite 68% of college members voting against such a change. In 1991 a new accommodation block was added to the main building. This block, the K block, is entirely ensuite and now typically reserved for final year and postgraduate students.